Annual Report,2009 - Directorate General of Mines Safety

DGMS Annual Report, 2009
The Roof Bolts and its components or parts shall be subjected to Accelerated
Weathering Test in mine water condition for 20 days. No deterioration should occur
on the Assembly.
(b) Accelerated Weathering Test shall also be conducted in acidic water
condition for 20 days during which no deterioration should occur on the Assembly.
(c) Corrosion Resistance Test :-
The Roof Bolt Assembly shall also be subjected to Field Exposure and Corrosion
Resistivity Test per IS-555: 1970 to test the resistance to corrosion of the steel of the
roof bolt and its parts. The Roof Bolt should pass the required test.
6.0 SAMPLING & TESTING
In order to check the composition and required parameters during manufacture, it shall
be required that the random sampling shall be collected at least 1 sample containing
adequate number/quantity of roof bolts and its accessories for every 10,000 pieces of
the product in a batch and shall be subjected to required set of tests as prescribed in
the previous paragraphs above and the data shall be kept recorded in a bound paged
book kept for the purpose which shall be signed by the persons carrying out the test
and shall be countersigned by the quality control officer posted at the manufacturing
unit (s).
6.1 The user shall carry out Physical examination tests as far as possible but shall
conduct Tensile Test of the Assembly for every batch of Roof Bolts & its Accessories
received at their end before use and keep the records in a bound paged book kept for
the purpose.
In case the Roof Bolts or any of its accessories fail to pass the required tests at the user
end, that lot of the manufacture shall not be used and intimation thereof shall be sent
to this Directorate and also to the manufacture.
Manufactures and the Users including the Test Houses, who are engaged for testing of
such material, are therefore requested to ensure the above mentioned Standard and
Parameters before supplying and using at the mine.
No. DGMS (Tech)/Circular No./ 11 Dhanbad, Dated – 20 th October, 2009
To,
Owner/Agent/Manager of all opencast Mines.
Sub:- Provisions of Rear Vision System in Equipments
Several accidents have occurred in opencast mines while reversing of equipment
especially in dumpers/tippers. The manufactures provide only audio visual alarm and
rear view mirrors in the equipments. Although the Audio Alarm gives warning to the
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